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Diop, E. S.; Soumaré, Abdoulaye; Diallo, N.; Guisse, Aliou

doi:10.1023/a:1009900724172

Cited by 45 publications

(6 citation statements)

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“…While mangrove expansion is occurring on several other continents, there is much variation in the environmental settings and the drivers responsible for these changes (Rogers & Krauss, 2019; Saintilan & Williams, 1999; Saintilan et al, 2014). For example, changing rainfall regimes (Diop et al, 1997; Eslami‐Andargoli et al, 2009), rapid sedimentation (Asbridge et al, 2015; Lovelock et al, 2010; Walcker et al, 2018), hydrologic alterations (Raabe et al, 2012), and rising sea levels (Howard et al, 2020; Krauss et al, 2011) are all common drivers of mangrove expansion. These drivers and the accompanying differences in environmental setting (e.g., geomorphology, climate, and the ecosystem properties of the interacting salt marshes and mangrove forests) greatly influence the ecological implications of mangrove expansion.…”

Section: Background: Mangrove Range Expansion In the Southeastern Uni...mentioning

confidence: 99%

The impacts of mangrove range expansion on wetland ecosystem services in the southeastern United States: Current understanding, knowledge gaps, and emerging research needs

Osland

Hughes

Armitage

et al. 2022

Global Change Biology

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Climate change is transforming ecosystems and affecting ecosystem goods and services. Along the Gulf of Mexico and Atlantic coasts of the southeastern United States, the frequency and intensity of extreme freeze events greatly influence whether coastal wetlands are dominated by freeze‐sensitive woody plants (mangrove forests) or freeze‐tolerant grass‐like plants (salt marshes). In response to warming winters, mangroves have been expanding and displacing salt marshes at varying degrees of severity in parts of north Florida, Louisiana, and Texas. As winter warming accelerates, mangrove range expansion is expected to increasingly modify wetland ecosystem structure and function. Because there are differences in the ecological and societal benefits that salt marshes and mangroves provide, coastal environmental managers are challenged to anticipate the effects of mangrove expansion on critical wetland ecosystem services, including those related to carbon sequestration, wildlife habitat, storm protection, erosion reduction, water purification, fisheries support, and recreation. Mangrove range expansion may also affect wetland stability in the face of extreme climatic events and rising sea levels. Here, we review the current understanding of the effects of mangrove range expansion and displacement of salt marshes on wetland ecosystem services in the southeastern United States. We also identify critical knowledge gaps and emerging research needs regarding the ecological and societal implications of salt marsh displacement by expanding mangrove forests. One consistent theme throughout our review is that there are ecological trade‐offs for consideration by coastal managers. Mangrove expansion and marsh displacement can produce beneficial changes in some ecosystem services, while simultaneously producing detrimental changes in other services. Thus, there can be local‐scale differences in perceptions of the impacts of mangrove expansion into salt marshes. For very specific local reasons, some individuals may see mangrove expansion as a positive change to be embraced, while others may see mangrove expansion as a negative change to be constrained.

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Section: Background: Mangrove Range Expansion In the Southeastern Uni...mentioning

confidence: 99%

The impacts of mangrove range expansion on wetland ecosystem services in the southeastern United States: Current understanding, knowledge gaps, and emerging research needs

Osland

Hughes

Armitage

et al. 2022

Global Change Biology

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“…However, at local scales, they occupy different intertidal zones, characterised by different types of soils. Avicennia germinans seem to prefer firmer and more sandy substrates associated with fibrous soils (i.e., with a high percentage of the organic matter in the form of undecomposed remains of Rhizophora rootles) (Jordan, 1964;Diop et al, 1997).…”

Section: Study Systemmentioning

confidence: 99%

Reduction of Genetic Variation When Far From the Niche Centroid: Prediction for Mangrove Species

Ochoa‐Zavala

Osorio‐Olvera

Cerón‐Souza

et al. 2022

Front. Conserv. Sci.

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The niche-centroid hypothesis states that populations that are distributed near the centroid of the species' ecological niche will have higher fitness-related attributes, such as population abundance and genetic diversity than populations near the edges of the niche. Empirical evidence based on abundance and, more recently, genetic diversity data support this hypothesis. However, there are few studies that test this hypothesis in coastal species, such as mangroves. Here, we focused on the black mangrove Avicennia germinans. We combined ecological, heterozygosity, and allelic richness information from 1,419 individuals distributed in 40 populations with three main goals: (1) test the relationship between distance to the niche centroid and genetic diversity, (2) determine the set of environmental variables that best explain heterozygosity and allelic richness, and (3) predict the spatial variation in genetic diversity throughout most of the species' natural geographic range. We found a strong correlation between the distance to the niche centroid and both observed heterozygosity (Ho; ρ2 = 0.67 P < 0.05) and expected heterozygosity (He; ρ2 = 0.65, P < 0.05). The niche variables that best explained geographic variation in genetic diversity were soil type and precipitation seasonality. This suggests that these environmental variables influence mangrove growth and establishment, indirectly impacting standing genetic variation. We also predicted the spatial heterozygosity of A. germinans across its natural geographic range in the Americas using regression model coefficients. They showed significant power in predicting the observed data (R2 = 0.65 for Ho; R2 = 0.60 for He), even when we considered independent data sets (R2= 0.28 for Ho; R2 = 0.25 for He). Using this approach, several genetic diversity estimates can be implemented and may take advantage of population genomics to improve genetic diversity predictions. We conclude that the level of genetic diversity in A. germinans is in agreement with expectations of the niche-centroid hypothesis, namely that the highest heterozygosity and allelic richness (the basic genetic units for adaptation) are higher at locations of high environmental suitability. This shows that this approach is a potentially powerful tool in the conservation and management of this species, including for modelling changes in the face of climate change.

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“…Thus, the water salinity is more or less stable in the mouth of the estuaries, but further upstream, the salinity increases during the dry season (i.e., from november to may) due to evaporation (Bertrand, 1999;Savenije & Pagès, 1992). During the great drought of the 1980s, the upper reaches of the estuaries became even hypersaline, causing a mass mortality of mangrove-inhabiting species (Diop et al, 1997;Marius, 1995).…”

Section: Climate Risks and Mma Threats To Mangrovesmentioning

confidence: 99%

Exploring the Influence of the Interaction of Climate Change, Manmade Threats and COVID-19 on the Livelihoods of Wetland Communities in Sub-Saharan Africa

Amoussou¹,

Edewor²,

Wane³

et al. 2022

JSD

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Wetlands are very important because of the wide range of ecosystem services they provide. Despite their ecological, social and environmental importance, these ecosystems are threatened and fragmented under the combined effects of climate change (CC) and man-made activities (MMA). Such a state of things could be exacerbated by the advent of the coronavirus disease 2019 (COVID-19) pandemic with its many implications. In order to help decision-makers take good decisions, the combined effect of CC, MMA and COVID-19 on the livelihoods of communities around wetland ecosystems have been reviewed based on available scientific knowledge. First, we analyzed the different concepts and theories underlying the wetlands-related studies and then summarized the merits and demerits of the different methodologies underlying wetland studies. The empirical evidences that exist in previous literatures have been highlighted. Similarly, common livelihood strategies for wetland communities in Sub-Saharan Africa (SSA) have been highlighted. The diversity of wetlands’ functions and services makes them a source of livelihood, food security and poverty alleviation for riverside communities. However, these communities lack the knowledge and awareness to understand the impact of their activities and CC on their livelihoods. The review also helped to identify that, out of the three factors investigated, the livelihoods of rural wetland dwellers in SSA are mostly influenced by CC and MMA. However, climate change and COVID-19 remain life-altering transboundary threats that extend in space and time, with large uncertainties on wetlands communities livelihoods.

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Cited by 45 publications

References 1 publication

The impacts of mangrove range expansion on wetland ecosystem services in the southeastern United States: Current understanding, knowledge gaps, and emerging research needs

The impacts of mangrove range expansion on wetland ecosystem services in the southeastern United States: Current understanding, knowledge gaps, and emerging research needs

Reduction of Genetic Variation When Far From the Niche Centroid: Prediction for Mangrove Species

Exploring the Influence of the Interaction of Climate Change, Manmade Threats and COVID-19 on the Livelihoods of Wetland Communities in Sub-Saharan Africa

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